linux-kernel - [PATCH] scsi: libsas: Fix disk not being scanned in after being removed

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Date: Wed, 21 Feb 2024 07:31:59 +0000
From: Xingui Yang <yangxingui@...wei.com>
To: <john.g.garry@...cle.com>, <yanaijie@...wei.com>, <jejb@...ux.ibm.com>,
	<martin.petersen@...cle.com>, <damien.lemoal@...nsource.wdc.com>
CC: <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linuxarm@...wei.com>, <prime.zeng@...ilicon.com>,
	<chenxiang66@...ilicon.com>, <kangfenglong@...wei.com>
Subject: [PATCH] scsi: libsas: Fix disk not being scanned in after being removed

As of commit d8649fc1c5e4 ("scsi: libsas: Do discovery on empty PHY to
update PHY info"), do discovery will send a new SMP_DISCOVER and update
phy->phy_change_count. We found that if the disk is reconnected and phy
change_count changes at this time, the disk scanning process will not be
triggered.

So update the PHY info with the last query results.

Fixes: d8649fc1c5e4 ("scsi: libsas: Do discovery on empty PHY to update PHY info")
Signed-off-by: Xingui Yang <yangxingui@...wei.com>
---
 drivers/scsi/libsas/sas_expander.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index a2204674b680..9563f5589948 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -1681,6 +1681,10 @@ int sas_get_phy_attached_dev(struct domain_device *dev, int phy_id,
 		if (*type == 0)
 			memset(sas_addr, 0, SAS_ADDR_SIZE);
 	}
+
+	if ((SAS_ADDR(sas_addr) == 0) || (res == -ECOMM))
+		sas_set_ex_phy(dev, phy_id, disc_resp);
+
 	kfree(disc_resp);
 	return res;
 }
@@ -1972,11 +1976,6 @@ static int sas_rediscover_dev(struct domain_device *dev, int phy_id,
 	if ((SAS_ADDR(sas_addr) == 0) || (res == -ECOMM)) {
 		phy->phy_state = PHY_EMPTY;
 		sas_unregister_devs_sas_addr(dev, phy_id, last);
-		/*
-		 * Even though the PHY is empty, for convenience we discover
-		 * the PHY to update the PHY info, like negotiated linkrate.
-		 */
-		sas_ex_phy_discover(dev, phy_id);
 		return res;
 	} else if (SAS_ADDR(sas_addr) == SAS_ADDR(phy->attached_sas_addr) &&
 		   dev_type_flutter(type, phy->attached_dev_type)) {
-- 
2.17.1